As soon as I walked to the door, I looked left and right.

Although he looked nonchalant, he always felt that something was wrong today.

I stretched out my nose and sniffed, and felt that for some reason, the air here was filled with a faint fragrance. When I smelled it carefully, it was the scent of citrus flowers.

It has been a long time since I smelled this kind of fragrance in this stuffy underground space.

He looked at the door he had just opened with suspicion. There was a shadow behind the door.

Just as he took a step towards the shadow, the human soldier patrolling below suddenly shouted upwards.

"Lao Yang, go on!"

A fluorescent drug-like agent flew in the air. The human soldier named Lao Yang stopped walking towards the door, turned around and quickly caught the agent.

At this moment, in the shadow behind the door, the blood kite in Ning Yu's hand was ready to go.

After the soldier received the drugs, he seemed to have a new goal in mind. He jumped down from above and activated his jet pack.

He slowly descended and went over to say something to the leader of the soldiers who were whispering over there.

At the same time he left, three people disappeared from the shadow behind the door and walked behind the mechanical door.

The space inside was indeed much more complicated than the outside, and all the passages were made of some kind of very hard metal.

These metal walls are covered with complex yet beautiful patterns, with only straight and diagonal lines used to create a futuristic look.

But these lines don't seem to be just for decoration. There is white energy flowing slowly on them, in waves, and there seems to be some pattern.

Ning Xuan walked in front, Ning Yu and Shen Yiyue followed closely behind. There was no one else in the passage for the time being.

"hiss"

Just after walking in, Ning Xuan suddenly covered her head, as if she had a headache.

"Xiaoxuan, what's wrong?"

Ning Yu walked up to her and asked her with concern, looking at the expression and movements on Ning Xuan's face.

"It's okay, sister. Maybe I've been too tired these days."

There seemed to be some signal flowing through Ning Xuan's eyes, flashing some patterns, but they disappeared immediately.

She quickly stopped what she was doing and stood up again. Ning Yu looked at her meaningfully from behind, with a thoughtful look in her eyes.

The three people walked to the corner in front and suddenly heard footsteps.

Ning Xuan's hand had turned into a prosthetic metal blade, but was held by Ning Yu.

Soon the soldiers who were patrolling inside came over. They did not turn here because this direction was the passage leading to the outside of the door.

The soldier stood at this intersection, looked toward the door, and then continued walking away.

Three people were hanging on the ceiling, and none of them made a sound.

After coming down from above, several people came to a place similar to a checkpoint, where there was a separate room with some metal panels.

There are no soldiers at this checkpoint at the moment.

"Sister, I'll go see if I can get a map of here."

Ning Xuan talked to Ning Yu and walked in first. Although this area was divided out on the underground engineering map she provided, no details were shown inside.

Ning Yu nodded slightly and waited for her outside with Shen Yiyue.

When Ning Xuan walked into the checkpoint, Ning Yu whispered beside Shen Yiyue: "How do you feel?"

"It's a little weird."

Shen Yiyue didn't look at Ning Xuan who was operating at the checkpoint, and pretended to be chatting with Ning Yu about random things.

"Do you want to take action, Xiaoyu?"

Ning Yu shook her head slightly when she heard that, and Shen Yiyue blinked knowingly. At this moment, Ning Xuan walked out.

"Sister, I got the data inside."

She walked up to the two people and raised her arm, which showed the core area of ​​the ceremony.

Although the entire building space is already underground, it still has a spiral downward structure, with two passages intersecting and leading to deeper underground.

And in the middle below, the two spiral passages that go to the deepest part will reach a closest center point.

If you look down from above, this area looks like two yin and yang fish entwined with each other and eventually merged into one.

I'm afraid that the area at the bottom is the core area of ​​the ceremony, and this is also their destination.

"We can go from here."

Ning Xuan pointed to a small path above, which led directly to the entrance of the double helix passage.

"The middle checkpoint is very lightly guarded. It seems to be the passage used by the soldier just now."

Ning Yu also saw clearly the distribution of the content represented above. The green light circles represented the guards distributed at the checkpoints and the directions of their changing of guards at different times.

She looked up at Ning Xuan. There was no expression on Ning Xuan's face. Her lake blue eyes were as calm as water and had no bottom.

All of this is really too coincidental.

She had just walked in here when she found a checkpoint that was unmanned and a passage that led to a key location.

It was as if everything was ready, just ready to lure Ning Yu into a trap.

But Ning Yu would not choose to retreat. He did not see any hostility from Ning Xuan in front of him, but Ning Yu knew very well that this might not be entirely Ning Xuan herself.

They followed the planned path, bypassing all the guards and occasionally encountered soldiers who were slacking off during the changing of guards.

These unlucky guys were killed by Ning Xuan with a single knife and then stuffed into the trash can. No sound was made from beginning to end.

As you go further in, you can clearly feel the atmosphere becoming more and more depressing. There seems to be an invisible pressure in the air, and a buzzing sound similar to white noise.

If ordinary people live in this kind of environment for a long time, I'm afraid they will become more or less neurasthenic.

The lines flowing on the metal channel next to it are becoming more and more dense. They are like breathing, sometimes bright and sometimes dim, and the brightness is different each time.

This underground building, which is made in a spiral shape, seems to be a living thing, breathing slowly and evenly.

After going through circle after circle of passages, they finally arrived in front of the double spiral passage.

In the small area in front of me, there are two small doors, one black and one white.

Ning Yu and the other two stood in the higher area, while in the lower area below, the two small doors were half open, as if welcoming someone to come closer.

The three of them looked at each other and were about to start discussing when something strange suddenly happened in the space.

The entire building suddenly shook violently, as if there was an earthquake.

The area behind the three of them suddenly began to collapse violently. The roar was deafening, and the screams of the soldiers could be faintly heard.